Cellulose-nitrate composition



-UNTTE@ STATES Parent castes.

PAUL C. SEEL, OF ROCHESTER, NEW YORK, ASSIGNOR TO OF ROCHESTER, NEWYORK, A CORPORATION OF NEW KODAK COMPANY, YORK.

CELLULOSE-NITRATE COMPOSITION.

No Drawing.

To all whom it may concern:

Be it known that 1, PAUL O. SEEL, a citizen of the United States ofAmerica, residingat Rochester, in the county of Monroe and State of New"York, have invented certain new and useful Improvements inCellulose-Nitrate Compositions, of which the following is a full, clear,and exact specification.

This invention relates to a cellulose nitrate composition in which thecellulose nitrate is combined or mixed with other substances so that theresulting product can be advantageously used in such arts as sheet orphotographic film manufacture and varnish manufacture.

One object of my invention is to provide a composition of matter, theinflammability of which is reduced to an important extent, so that itbecomes relatively safe in use. Another object is to provide acomposition which may be made into permanently transparent strong andflexible sheets or films of desired thinness, that are substantiallywaterproof, are unafi'ected by ordinary phoe tographic fluids andpossess the desired properties of a support for sensitive photographiccoatings. Another object of my invention is to matter capable 0 easymanipulation in the or. varnish making and allied arts; which will notinjure or be injured by the machinery or substances with which it isassociated during manufacture, storage, or use. Further objects willhereinafter appear.

T have discovered that a composition of matter having the desirablequalities enumerated hereinabove can be obtained by mixing orcompounding cellulose nitrate 'with the monohydroxy aliphatic alcoholshaving more than two carbon atoms, such as fusel oil, butyl alcohol,amyl alcohol, etc., together with triphenyl phosphate. This compoundingis best performed by mixing the cellulose nitrate, the higher alcohol oralcohols, and the triphenyl phosphate with a solvent common to all ofthem, such as methyl alcohol, or acetone, or a mixture thereof.

lln carrying out one illustration of my invention, I employ from 175 to400 parts (say for instance 250 parts) of methyl alcohol or acetone, ora mixture of these two substances in any proportion relative toSpecification of Letters Patent.

produce a composition of Patented May 24, 11921.

Application filed April 26, 1919. Serial No. 292,998.

each other. In such solvent T incorporate 50 parts of cellulose nitrate,such as nitrated cotton, 10 to parts of fusel oil (say for instance 20parts) and 5 to 50 parts of triphenyl phosphate (say for example 7.5parts). The ingredients are mixed to form a homogeneous solution orflowable mass which is filtered if desired, such operation beinggenerally employed if the mass is to alcohol or acetone, or mixturethereof, volatilizing, but the mixture being such that the volatilesolvent does not go off so rapidly as to impair the product. Theresulting films containing the unvolatilized ingredients are soflexible, smooth, transparent and uniform that they maybe used. foranyusual or preferred purpose. Due to their reduced inflammability theyform excellent motion.

picture film supportor base. They are practically waterproof andunaffected by ordinary photographic chemicals. The triphenyl phosphateand the fusel oil, particularly the former, are of such low volatilitythat the amount lost during the desired life of the film is negligibleand will not render such film unserviceable. The triphenyl phosphateseems to impart a degree of suppleness to the film, as does also thefusel oil in" a useful degree, and these substances moreover retain theclearness or transparencyof the film. The triphenyl phosphate ispractically non-inflammable and the film containing it in the preferredproportions has its inflammability diminished to a very noteworthy anddesirable extent. .The triphenyl phosphate does not during manufacturedecompose or chemically re-act with or injure the other bodiesassociated with it in the solution, nordoes it attack the metal parts ofthe machinery to any harmful deter for forming tough, transparent,flexible sheets, comprising cellulose nitrate 50 parts, triphenylphosphate 5 to 50 parts, a monohydroxy aliphatic alcohol having fromfour to five carbon atoms 10 to 60 parts and a volatile solventcontaining methyl alcohol 175 to 400 parts.

2. A viscous fiowable composition of matter for forming tough,transparent, flexible films, comprising cellulose nitrate 50 parts,triphenyl phosphate 5 to 50 parts, -fusel oil 10 to 60 parts, and amixture of acetone and methyl alcohol17 5 to 400 parts.

3. As an article of manufacture a flowed, strong, flexible, transparent,waterproof, 15 sheet of reduced inflammability, comprising cellulosenitrate, a monohydroxy aliphatic alcohol containing from four to fivecarbon atoms, and triphenyl phosphate.

4. A composition of matter comprising 20 cellulose nitrate, triphenylphosphate and fusel oil.

Signed at Rochester, New York, this 22nd day of April, 1919.

PAUL o. SEEL.

